Volume 3, Issue 4, Pages 652-664 (October 2017) Supported Cobalt Polyphthalocyanine for High-Performance Electrocatalytic CO2 Reduction Na Han, Yu Wang, Lu Ma, Jianguo Wen, Jing Li, Hechuang Zheng, Kaiqi Nie, Xinxia Wang, Feipeng Zhao, Yafei Li, Jian Fan, Jun Zhong, Tianpin Wu, Dean J. Miller, Jun Lu, Shuit-Tong Lee, Yanguang Li Chem Volume 3, Issue 4, Pages 652-664 (October 2017) DOI: 10.1016/j.chempr.2017.08.002 Copyright © 2017 Elsevier Inc. Terms and Conditions
Chem 2017 3, 652-664DOI: (10.1016/j.chempr.2017.08.002) Copyright © 2017 Elsevier Inc. Terms and Conditions
Figure 1 Preparation and Electron Microscopic Characterizations of CoPPc/CNT Schematic illustration of the synthetic process of CoPPc/CNT (A); SEM (B) and TEM (C) images of CoPPc/CNT; HAADF image (D) and corresponding C, N, and Co EDS elemental mapping (E and F). The core-sheath hybrid structure is discernible. Chem 2017 3, 652-664DOI: (10.1016/j.chempr.2017.08.002) Copyright © 2017 Elsevier Inc. Terms and Conditions
Figure 2 Spectroscopic Characterizations of CoPPc/CNT (A and B) Raman spectra (A) and FT-IR spectra (B) of CoPPc/CNT in comparison with CoPPc, commercial CoPc, and pure CNT. (C and D) Co K-edge XANES spectrum (C) and corresponding Fourier transform EXAFS spectrum (D) of CoPPc/CNT showing features characteristic to the Co-N4 structure. (E) UV-vis spectra of CoPPc/CNT in comparison with pure CoPPc, CoPc, and pure CNT. Chem 2017 3, 652-664DOI: (10.1016/j.chempr.2017.08.002) Copyright © 2017 Elsevier Inc. Terms and Conditions
Figure 3 CO2RR Performance of CoPPc/CNT in CO2-Saturated 0.5 M NaHCO3 (A) CV curves of CoPPc/CNT, CoPPc, and commercial CoPc. (B) Chronoamperometric responses of CoPPc/CNT at different potentials as indicated. (C) CO faradic efficiency of CoPPc/CNT, CoPPc, and CoPc. (D) Specific CO current and TOF of CoPPc/CNT, CoPPc, and CoPc. (E) Corrected TOF of CoPPc/CNT in comparison with a few of the best results extracted from the literature. (F) Tafel plots of CoPPc/CNT, CoPPc, and CoPc. Chem 2017 3, 652-664DOI: (10.1016/j.chempr.2017.08.002) Copyright © 2017 Elsevier Inc. Terms and Conditions
Figure 4 DFT Simulations of the CO2RR Process on a CoPPc Monolayer The optimized geometric structure of various states (CoPPc, CoPPc−, CO2−*, COOH*, and CO*) along the reaction path of CO2RR on a 2D CoPPc monolayer. Co, N, O, C, and H atoms are presented by orange, blue, red, gray, and green spheres, respectively. For CoPPc− and CO2−*, the electron-density differences caused by electron injection and CO2 adsorption are also plotted. Cyan and purple correspond to electron accumulation and depletion regions, respectively. Also shown are Co–N bond lengths (A and B) and Co–C bond lengths (C–E) in Ångstroms. (F) Proposed mechanistic scheme for the CO2RR on CoPPc. Chem 2017 3, 652-664DOI: (10.1016/j.chempr.2017.08.002) Copyright © 2017 Elsevier Inc. Terms and Conditions
Figure 5 Long-Term Operation Stability of CoPPc/CNT Changes in current density and faradic efficiency of CoPPc/CNT over 24 hr at −0.54 V (η = 0.43 V). Chem 2017 3, 652-664DOI: (10.1016/j.chempr.2017.08.002) Copyright © 2017 Elsevier Inc. Terms and Conditions